139666699 has 2 divisors, whose sum is σ = 139666700. Its totient is φ = 139666698.

The previous prime is 139666693. The next prime is 139666717. The reversal of 139666699 is 996666931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139666699 - 2²¹ = 137569547 is a prime.

It is not a weakly prime, because it can be changed into another prime (139666693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69833349 + 69833350.

It is an arithmetic number, because the mean of its divisors is an integer number (69833350).

Almost surely, 2^139666699 is an apocalyptic number.

139666699 is a deficient number, since it is larger than the sum of its proper divisors (1).

139666699 is an equidigital number, since it uses as much as digits as its factorization.

139666699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2834352, while the sum is 55.

The square root of 139666699 is about 11818.0666354527. The cubic root of 139666699 is about 518.8370200172.

The spelling of 139666699 in words is "one hundred thirty-nine million, six hundred sixty-six thousand, six hundred ninety-nine".